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Related Experiment Video

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Hemispatial Neglect Shows That "Before" Is "Left".

Mario Bonato1, Arnaud Saj2, Patrik Vuilleumier3

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Summary

Temporal event order is spatially represented from left to right, similar to writing. This spatial representation of time is impaired by spatial neglect but not by right-hemisphere damage alone.

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Area of Science:

  • Cognitive Neuroscience
  • Neuropsychology
  • Psychology

Background:

  • Recent research suggests time perception may be spatially mapped, akin to writing direction.
  • Spatial neglect, a disorder affecting left-sided spatial awareness due to right-hemisphere damage, provides a unique model to test this hypothesis.

Purpose of the Study:

  • To investigate whether the spatial representation of temporal event order is impaired in patients with spatial neglect.
  • To determine if temporal ordinality processing relies on spatial mechanisms.

Main Methods:

  • Fourteen right-hemisphere damaged patients, with or without neglect, performed a temporal ordering task.
  • Participants categorized story events relative to a temporal reference point.
  • Response times and accuracy were analyzed for effects related to event order and spatial neglect.

Main Results:

  • Neglect patients exhibited an asymmetric distance effect, with slower responses for events preceding the reference point.
  • This pattern mirrored findings in numerical comparison tasks, suggesting a shared spatial representation for ordinality.
  • A left-to-right scanning preference was observed, with the first event eliciting slower responses than the last.

Conclusions:

  • The findings support the hypothesis that temporal event order is processed via spatial mechanisms.
  • Ordinality representation appears to be domain-general, applying similarly to both temporal and numerical information.
  • Spatial neglect specifically impairs the spatial representation of temporal sequences.